AZ31B变形镁合金TIG焊接头组织及断口形貌分析  

Microstructure and Fracture Morphology Analysis of TIG Welding Joint for Wrought Magnesium Alloy AZ31B

作　　者：梁国俐[1] 苑少强[1] 张晓娟[1] 

机构地区：[1]唐山学院机电工程系,唐山063000

出　　处：《材料导报（纳米与新材料专辑）》2008年第3期379-380,共2页

基　　金：唐山市科学技术及发展计划(07160203B-1)

摘　　要：以AZ31变形镁合金为研究对象,采用光学显微镜和扫描电子显微镜等测试手段对其TIG交流自动焊接头的微观组织和接头的断口形貌进行了观察分析,结果表明,在TIG自动焊条件下,AZ31B镁合金接头的焊缝区主要为细小的等轴晶,热影响区为粗大的过热组织,晶粒比较粗大,通过对接头断口形貌观察发现其接头断裂特征为韧-脆混合断裂。In this paper it is based on the wrought magnesium alloy AZ31B to analyze the microstructure and fracture morphology of TIG welding joint by optical microscope and scanning electron microscope. The results show that under the TIG auto-welding condition the weld zone of joint presents fine equiaxed grains, the heat affected zone presents overheating microstructures and the grain is obviously coarse. The fracture morphology presents mixed fracture feature with toughness-brittleness.

关 键 词：AZ31B镁合金 TIG焊 微观组织 断口形貌 

分 类 号：TG606[金属学及工艺—金属切削加工及机床] TG453